I really need your help.
I want to reinit all global initialized variables in my C-Sourcecode again after start of the S12P microcontroller (like "int example = 8").
I thought I would know how to do this, but I have lots of problems.
The only thing I need to know is the adress in ROM where the initial values are stored, right?
After I know that, I would be able to write a function to get these values again and reinitialize the variables any time I want to... thats my plan, if you have better suggestions tell me please.
I read the linker manual today and thought the adress of my global initialized data is representated by .copy, so the ELF name is COPY.
Problem: I always get a linker warning that there is no information about the segment COPY !?
My prm-file looks like:
PLACEMENT /* here all predefined and user segments are placed into the SEGMENTS defined above. */
_PRESTART, /* Used in HIWARE format: jump to _Startup at the code start */
STARTUP, /* startup data structures */
ROM_VAR, /* constant variables */
STRINGS, /* string literals */
VIRTUAL_TABLE_SEGMENT, /* C++ virtual table segment */
//.ostext, /* OSEK */
NON_BANKED, /* runtime routines which must not be banked */
COPY /* copy down information: how to initialize variables */
/* in case you want to use ROM_4000 here as well, make sure
that all files (incl. library files) are compiled with the
option: -OnB=b */
INTO ROM_C000/*, ROM_1400, ROM_4000*/;
DEFAULT_ROM INTO PAGE_08, PAGE_09, PAGE_0A, PAGE_0B, PAGE_0C, PAGE_0C_A800, PAGE_0E ;
//.stackstart, /* eventually used for OSEK kernel awareness: Main-Stack Start */
SSTACK, /* allocate stack first to avoid overwriting variables on overflow */
//.stackend, /* eventually used for OSEK kernel awareness: Main-Stack End */
DEFAULT_RAM INTO RAM;
//.vectors INTO OSVECTORS; /* OSEK */
What I do in the Sourcecode (like the example in the linker manual):
#define __SEG_START_REF(a) __SEG_START_ ## a
#define __SEG_START_DEF(a) extern char __SEG_START_REF(a) 
test= (char*)__SEG_START_REF(COPY); /* this should be the startaddress of the segment COPY! */
If I try to do the same with SSTACK instead of COPY, everythings ok and I DO get the begin of the stack at the address 0x2800!
Where's the failure???
Thanks for any hints!